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21 May 2007 <br /> AGE-NC Project No. 04-1045 <br /> Page 2 of 7 <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the EHD. In addition, an update to the <br /> health and safety plan presently on-file will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> 1985). Prior to mobilization, each monitoring well location will be clearly marked and a utility <br /> clearance obtained through Underground Service Alert. <br /> 2.2. DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance three pilot soil borings at the site for installation of ground water <br /> monitoring wells,using a truck-mounted,hollow-stem drill rig equipped with 8.25-inch hollow-stem <br /> augers to advance the two well borings to approximately 65 feet bsg and one well boring to 120 feet <br /> bsg; the total depth of each well boring may vary according to hydrogeologic/geologic conditions <br /> encountered during drilling. <br /> • Proposed pilot boring MW-9 will be advanced approximately 10 feet south of existing well <br /> MW-1, highest known concentration of dissolved hydrocarbons, �S- <br /> • Proposed pilot boring MW-10 will be advanced approximately 25 feet soutH/"of existing well <br /> MW-8, down-gradient from highest known concentration of dissolved hydrocc?rbons, <br /> a <br /> • Prop sed pilot boring MW-11 will be advanced approximately 25 feet south�of existing well <br /> MW-J, in the down-gradient, vertically, from highest known concentration of dissolved <br /> hydrocarbons (Figure 2). (� �c Z-dL— <br /> Petroleum hydrocarbons and fuel additive(1,2-DCA)have been detected in the deepest soil samples <br /> collected, 65 feet bsg, at the former UST area.The soil impact is not defined vertically, thus <br /> justifying the sampling of the deep soil boring to 120 feet bsg. Soil samples will be collected from <br /> within the 8.25-inch hollow-stem augers at five-foot intervals beginning_at 40 feet bsg using a (t/ <br /> California split-spoon sampler and brass sleeves. The soil sample with the highest observable S.d, l <br /> contamination,and at depths to 00 feet bs should be analyzed.Selected soil samples with geologic .SCS ' <br /> significance or considerable lack o ydrocarbon impact should be analyzed by a State of California <br /> DHS-certified laboratory for the fo lowing constituents: 'rI1`J ; <br /> • Total petroleum hydrocar ns quantified as gasoline (TPH-g) in accordance with EPA 1 <br /> Method 8015 Modified, 19 <br /> `10 <br /> Advanced GeoEnvironmental,Inc. <br />